High capacity absorption of SO2 using imidazole ionic liquid mixtures

doi:10.11949/0438-1157.20200790

Abstract

Abstract:

The capture of sulfur dioxide (SO₂) with readily available and cost-effective ionic liquids (ILs) is one of the challenges for the application of ILs. Here, we synthesized the ILs mixtures with different molar ratios (3∶1, 2∶1, 1∶1, 1∶2, and 3∶1) of 1-ethyl-3-methylimidazolium chloride ([Emim][Cl]) and 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]) to study their SO₂ absorption capacities. The SO₂ solubilities in these mixtures were investigated under different conditions. The SO₂ absorption capacities of [Emim][Cl]_x[OAc]_1-_x at different temperatures and SO₂ partial pressure were measured. The results show that ILs can effectively capture SO₂. There exists a synergistic promotion effect between [Emim][Cl] and [Emim][OAc], resulting in quite high SO₂ absorption capacity. The [Emim][Cl]_0.33[OAc]_0.66 mixture can capture SO₂ (1.34±0.08) and (0.74±0.05) g/g at 1.0 and 0.2 atm(1 atm=101325 Pa), respectively. Comparing with the reported data, [Emim][Cl]_x[OAc]_1-_x mixtures show obvious advantage for SO₂ capture. In addition, these ionic liquid mixtures have good reversibility for the absorption and desorption of sulfur dioxide.

Key words: ionic liquids, physical property, absorption, sulfur dioxide, desorption

摘要：

开发易制备、价格便宜、面向SO₂气体高效分离的离子液体（ILs），是当前ILs从实验探索迈向工业应用的难点与重大挑战。合成了不同摩尔比（3∶1、2∶1、1∶1、1∶2和1∶3）的1-乙基-3-甲基咪唑氯盐（[Emim][Cl]）和1-乙基-3-甲基咪唑乙酸盐（[Emim][OAc]）的离子液体混合物[Emim][Cl]_x[OAc]_1-_x，在测定其密度、黏度、热稳定性等基本物性数据的基础上，研究了[Emim][Cl]_x[OAc]_1-_x混合物在不同温度和SO₂分压下的SO₂吸收能力。结果表明，[Emim][Cl]_x[OAc]_1-_x能够有效地捕获SO₂。[Emim][Cl]与[Emim][OAc]之间存在协同促进作用，有利于实现SO₂高效吸收。[Emim][Cl]_0.33[OAc]_0.66混合液在1.0和0.2 atm（1 atm=101325 Pa）下捕获SO₂量分别为（1.34±0.08）和（0.74±0.05） g/g，与现有结果相比，混合物在SO₂捕获方面有明显优势。此外，这些离子液体混合物对二氧化硫的吸收和解吸具有良好的可逆性。

关键词: 离子液体, 物理性质, 吸收, 二氧化硫, 解吸

CLC Number:

O 69

Yating ZHANG,Wenjie XIONG,Tianxiang ZHAO,Chenfei YAO,Yucheng DING,Xiaomin ZHANG,Youting WU,Xingbang HU. High capacity absorption of SO₂ using imidazole ionic liquid mixtures[J]. CIESC Journal, 2020, 71(11): 5035-5042.

张雅婷,熊文杰,赵天翔,姚晨飞,丁宇宬,张效敏,吴有庭,胡兴邦. 咪唑类离子液体混合物用于二氧化硫高效吸收[J]. 化工学报, 2020, 71(11): 5035-5042.

Figures/Tables 12

References 38

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离子液体	ρ - T			η - T
离子液体	A	B	R²	a	b	c	R²
[Emim][OAc]	1.124	-6.16×10^-4	0.9989	73.35	-0.34	4.58×10^-4	0.9992
[Emim][Cl]_0.75[OAc]_0.25	1.151	-5.94×10^-4	0.9999	83.00	-0.44	5.97×10^-4	0.9978
[Emim][Cl]_0.66[OAc]_0.33	1.145	-5.93×10^-4	0.9999	65.79	-0.34	4.60×10^-4	0.9999
[Emim][Cl]_0.5[OAc]_0.5	1.140	-6.06×10^-4	0.9998	64.66	-0.40	5.51×10^-5	0.9999
[Emim][Cl]_0.33[OAc]_0.66	1.334	-6.12×10^-4	0.9999	78.22	-0.42	5.89×10^-6	0.9992
[Emim][Cl]_0.25[OAc]_0.75	1.133	-6.09×10^-4	0.9999	69.07	-0.37	5.06×10^-4	0.9998

离子液体	ρ - T			η - T
离子液体	A	B	R²	a	b	c	R²
[Emim][OAc]	1.124	-6.16×10^-4	0.9989	73.35	-0.34	4.58×10^-4	0.9992
[Emim][Cl]_0.75[OAc]_0.25	1.151	-5.94×10^-4	0.9999	83.00	-0.44	5.97×10^-4	0.9978
[Emim][Cl]_0.66[OAc]_0.33	1.145	-5.93×10^-4	0.9999	65.79	-0.34	4.60×10^-4	0.9999
[Emim][Cl]_0.5[OAc]_0.5	1.140	-6.06×10^-4	0.9998	64.66	-0.40	5.51×10^-5	0.9999
[Emim][Cl]_0.33[OAc]_0.66	1.334	-6.12×10^-4	0.9999	78.22	-0.42	5.89×10^-6	0.9992
[Emim][Cl]_0.25[OAc]_0.75	1.133	-6.09×10^-4	0.9999	69.07	-0.37	5.06×10^-4	0.9998

ILs	SO₂absorption at 20℃/(g/g)	Ref.
[Emim][Cl]_0.75[OAc]_0.25	1.32±0.08	this work
[Emim][Cl]_0.66[OAc]_0.33	1.33±0.08	this work
[Emim][Cl]_0.5[OAc]_0.5	1.20±0.07	this work
[Emim][Cl]_0.33[OAc]_0.66	1.34±0.08	this work
[DMDEEH][MOAc]	1.02	[9]
[DMDEEH][EOAc]	1.06	[9]
[DMDEEH][MEAAc]	1.04	[9]
[EDBEAH][MOAc]	0.34	[9]
[TMPDAH][BAc]	1.23	[9]
EminCl-AA(2∶1)	1.39	[10]
[NH₂Emim][OAc]-[Bmim][OH] (1∶1)	0.36^①	[11]
[N₂₂₂₂][FA]/PEG₂₀₀	0.46^②	[12]
[Ch][FA]/PEG₂₀₀	0.30^②	[12]
[TMG][SUC]	0.88^①	[16]
[TMG][SUB]	0.95	[16]
[TMG][DOD]	0.83	[16]
[Emim][SCN]	1.13	[18]
[Emim][C(CN)₃]	0.74	[18]
[Emim][Cl]	1.20^③	[20]
[C₄Py][SCN]	0.44	[21]
[C₄Py][BF⁴]	0.84	[21]
[Emim][Cl][SCN](1∶1)	1.22	[22]
ChCl-EG (1∶2)	0.70	[23]
ChCl-thiourea (1∶1)	0.88	[23]

ILs	SO₂absorption at 20℃/(g/g)	Ref.
[Emim][Cl]_0.75[OAc]_0.25	1.32±0.08	this work
[Emim][Cl]_0.66[OAc]_0.33	1.33±0.08	this work
[Emim][Cl]_0.5[OAc]_0.5	1.20±0.07	this work
[Emim][Cl]_0.33[OAc]_0.66	1.34±0.08	this work
[DMDEEH][MOAc]	1.02	[9]
[DMDEEH][EOAc]	1.06	[9]
[DMDEEH][MEAAc]	1.04	[9]
[EDBEAH][MOAc]	0.34	[9]
[TMPDAH][BAc]	1.23	[9]
EminCl-AA(2∶1)	1.39	[10]
[NH₂Emim][OAc]-[Bmim][OH] (1∶1)	0.36^①	[11]
[N₂₂₂₂][FA]/PEG₂₀₀	0.46^②	[12]
[Ch][FA]/PEG₂₀₀	0.30^②	[12]
[TMG][SUC]	0.88^①	[16]
[TMG][SUB]	0.95	[16]
[TMG][DOD]	0.83	[16]
[Emim][SCN]	1.13	[18]
[Emim][C(CN)₃]	0.74	[18]
[Emim][Cl]	1.20^③	[20]
[C₄Py][SCN]	0.44	[21]
[C₄Py][BF⁴]	0.84	[21]
[Emim][Cl][SCN](1∶1)	1.22	[22]
ChCl-EG (1∶2)	0.70	[23]
ChCl-thiourea (1∶1)	0.88	[23]

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High capacity absorption of SO₂ using imidazole ionic liquid mixtures

咪唑类离子液体混合物用于二氧化硫高效吸收

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